Este circuito puede servir de protección para fuentes e incluso prepara cargas en caso de cortocircuito, pues cuando ocurre esto, la alimentación se corta inmediatamente. Si se deshace el corto, la alimentación es restablecida de modo automático. El circuito opera con fuentes de haste 12V y corriente de 1 A.

En la protección de redes de alimentación se usan disyuntores, normalmente de operación térmica, que desarman, interrumpiendo el pasaje de corriente en caso de cortocircuito.

El disyuntor que presentamos es electrónico, para fuentes de comente continua de hasta 1A.

Este circuito desarma cuando la corriente se eleva más allá de un cierto valor preajustado en un trimpot, haciendo que el transistor principal entre en corte, interrumpiendo así la circulación de esta misma corriente.

Como el circuito es un sensor de tensión, mientras el corto se mantenga no hay rearme.

El montaje de este sistema es bastante sencillo y los pocos elementos usados permiten que se lo agregue a fuentes de alimentación comunes.

Se pueden hacer modificaciones en el circuito original para que aumente su capacidad de corriente.

 

El circuito

Los dos diodos (D1 y D2) estabilizan la tensión de base del transistor Q2. De esta forma, tenemos una fuente de corriente constante que polariza la base de Q1.

La corriente de colector de Q1 será, entonces, dada por la corriente constante del colector de Q2 multiplicada por su ganancia. Este valor nos da la intensidad máxima de control del circuito.

El transistor Q1 opera en la parte ascendente de la curva caracteristica Ic/Vce en que existe un ”codo" donde se inicia la saturación (figura 1).

 


 

 

A partir del codo, la curva se vuelve prácticamente horizontal. Tenemos entonces dos sectores, uno de ascensión de la curva y otro prácticamente horizontal, que se diferencian por la resistencia interna presentada por el transistor. En un caso, tenemos una resistencia muy alta y en el otro una resistencia muy baja.

El transistor opera normalmente en el sector de baja resistencia dejando pasar toda la corriente posible para la carga.

Pero si ocurriera un corto circuito en la salida, el punto de funcionamiento se desplaza hacia el sector en que tenemos una resistencia elevada. En estas condiciones, el transistor Q2 no puede mantener más constante su corriente de colector, desactivando así la carga.

Vea que el transistor Q1 debe ser dotado de un buen disipador de calor, pues tiende a calentarse en caso de cortocircuito.

 

Montaje

En la figura 2 tenemos el diagrama completo del aparato.

 


 

 

En la figura 3 tenemos una pequena placa de circuito impreso para este montaje.

 


 

 

Los resistores son todos de 1/8 6 1/4W y el capacitor electrolítico debe tener tensión de trabajo poco mayor que la salida de la fuente.

Se pueden usar equivalentes a lós transistores indicados. Para Q2 tenemos los BC237, BC238. BC547, etc. Para Q1 podremos usar otros PNP de potencia como el TIP42 y el BC138, este último para corriente máxima de 1A.

 

Ajuste y uso

El único ajuste es del punto de disparo, hecho en P1. Conecte el disyuntor en la salida de una fuente y un voltimetro en la salida del disyuntor.

Debe haber una indicación de la salida de tensión deseada. Después, coloque en la salida la carga máxima prevista para que haya desconexión y ajuste P1 para que la tensión carga a cero.

Sin la carga y/o con cargas menores, la tensión debe ser normal, y con la carga máxima o poco menor debe haber accionamiento del sistema.

Comprobado el funcionamiento, solo resta hacer la instalación definitiva del aparato en una fuente.

 


 

 

 

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